Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d725354c145c9ed…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9572393307e0a88276a46fc714813aa SHA-1: 304f430a778b5d83cd1abdd35cc72f6bf3f39ed9 SHA-256: 7d725354c145c9ed95501a5c42c27698fa703bef0707e719d47db2668212b7cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites. While no scripts were explicitly extracted, the nature of PDF-based attacks often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://s-moonlight.com/CKEdit/upload/files/luwarenubijisib.pdf
    • http://drcleancenter.com/uploads/files/202108281456141983.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0e0dcf2c5ecf256b9304a22fac56bf52/jizepitarav.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607961ff5547e---lumatirulerena.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d2d05731220eb30b2f841a0c7c57e9e5/532733344.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gawokuza.pdf
    • http://esistore.de/userfiles/file/gilimonajepodale.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a6a1c0ab---49566953394.pdf
    • http://karpatskiles.ru/store/files/60173723910.pdf
    • https://shellserva.nl/docs/Image/file/1658328240.pdf
    • https://hanomanberjaya.com/contents//files/posagarej.pdf
    • https://pima-alarms.rs/slicice/file/gefojixowofutirevos.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1626220758.pdf
    • https://viettincapital.vn/upload/files/fifukimofokudezom.pdf
    • https://jamisonfurnace.ca/userfiles/files/26076746223.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/8779768198.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72a308edd---78043529880.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4122a7c39b0abd0128365ded09c42301/29736438529.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7624ab35---32877251323.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/nivegikizowoda.pdf
    • https://lesura.net/userfiles/file/pewetemij.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/felexaverasetiz.pdf
    • http://mengnuanua.com/app/webroot/files/files/27047232957.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ucp+600+pdf+icc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f510.bin
ab08bf6d8f9e85cea00e37aeba8d145e005a2bcd70b757747b5a26b02b2cc85f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 9980 bytes
font_01_sfnt_off00010b2c.bin
7f53d53039a0ad05f08e71106360fb54935ab7dc79d270066505a227d3bdad85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 20844 bytes
font_02_sfnt_off000142c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16792 bytes